Buggy code:
public void addEncodedArgument ( String name , String value , String metaData , String contentEncoding ) { } public void addEncodedArgument ( String name , String value , String metaData ) { } public void addNonEncodedArgument ( String name , String value , String metadata ) { } public void addArgument ( String name , String value ) { } public void addArgument ( String name , String value , String metadata ) { } public boolean hasArguments ( ) { } @ Override public void addTestElement ( TestElement el ) { } public void setPort ( int value ) { } public static int getDefaultPort ( String protocol , int port ) { } public int getPortIfSpecified ( ) { } public boolean isProtocolDefaultPort ( ) { } public int getPort ( ) { } public void setDomain ( String value ) { } public String getDomain ( ) { } public void setConnectTimeout ( String value ) { } public int getConnectTimeout ( ) { } public void setResponseTimeout ( String value ) { } public int getResponseTimeout ( ) { } public String getProxyHost ( ) { } public int getProxyPortInt ( ) { } public String getProxyUser ( ) { } public String getProxyPass ( ) { } public void setArguments ( Arguments value ) { } public Arguments getArguments ( ) { } public void setAuthManager ( AuthManager value ) { } public AuthManager getAuthManager ( ) { } public void setHeaderManager ( HeaderManager value ) { } public HeaderManager getHeaderManager ( ) { } public void setCookieManager ( CookieManager value ) { } public CookieManager getCookieManager ( ) { } public void setCacheManager ( CacheManager value ) { } public CacheManager getCacheManager ( ) { } public boolean isImageParser ( ) { } public void setImageParser ( boolean parseImages ) { } public String getEmbeddedUrlRE ( ) { } public void setEmbeddedUrlRE ( String regex ) { } protected HTTPSampleResult errorResult ( Throwable e , HTTPSampleResult res ) { } private static final String HTTP_PREFIX = ( PROTOCOL_HTTP ) + ":////" ; private static final String HTTPS_PREFIX = ( PROTOCOL_HTTPS ) + ":////" ; public java . net . URL getUrl ( ) throws MalformedURLException { } public String getQueryString ( ) { } public String getQueryString ( String contentEncoding ) { } public void parseArguments ( String queryString , String contentEncoding ) { } public void parseArguments ( String queryString ) { } @ Override public String toString ( ) { } public SampleResult sample ( Entry e ) { } public SampleResult sample ( ) { } private HTTPSampleResult fileSample ( URI uri ) throws IOException { } protected abstract HTTPSampleResult sample ( java . net . URL u , String method , boolean areFollowingRedirect , int depth ) { } protected HTTPSampleResult downloadPageResources ( HTTPSampleResult res , HTTPSampleResult container , int frameDepth ) { } private String getParserClass ( HTTPSampleResult res ) { } protected String encodeSpaces ( String path ) { } public void testEnded ( ) { } public void testEnded ( String host ) { } public void testIterationStart ( LoopIterationEvent event ) { } public void testStarted ( ) { } public void testStarted ( String host ) { } @ Override public Object clone ( ) { } protected HTTPSampleResult followRedirects ( HTTPSampleResult res , int frameDepth ) { } protected HTTPSampleResult resultProcessing ( boolean areFollowingRedirect , int frameDepth , HTTPSampleResult res ) { } protected boolean isSuccessCode ( int code ) { } protected static String encodeBackSlashes ( String value ) { } private void setHTTPFileArgs ( HTTPFileArgs value ) { } private HTTPFileArgs getHTTPFileArgs ( ) { } public HTTPFileArg [ ] getHTTPFiles ( ) { } public int getHTTPFileCount ( ) { } public void setHTTPFiles ( HTTPFileArg [ ] files ) { } public static String [ ] getValidMethodsAsArray ( ) { } public static boolean isSecure ( String protocol ) { } public static boolean isSecure ( java . net . URL url ) { } public void threadStarted ( ) { } public void threadFinished ( ) { } public byte [ ] readResponse ( SampleResult sampleResult , InputStream in , int length ) throws IOException { byte [ ] readBuffer = getThreadContext ( ) . getReadBuffer ( ) ; int bufferSize = 32 ; MessageDigest md = null ; boolean asMD5 = useMD5 ( ) ; if ( asMD5 ) { try { md = MessageDigest . getInstance ( "MD5" ) ; } catch ( NoSuchAlgorithmException e ) { HTTPSamplerBase . log . error ( "Should<seq2seq4repair_space>not<seq2seq4repair_space>happen<seq2seq4repair_space>-<seq2seq4repair_space>could<seq2seq4repair_space>not<seq2seq4repair_space>find<seq2seq4repair_space>MD5<seq2seq4repair_space>digest" , e ) ; asMD5 = false ; } } else { if ( length <= 0 ) { bufferSize = 4 * 1024 ; } else { bufferSize = length ; } } ByteArrayOutputStream w = new ByteArrayOutputStream ( bufferSize ) ; int bytesRead = 0 ; int totalBytes = 0 ; boolean first = true ; while ( ( bytesRead = in . read ( readBuffer ) ) > ( - 1 ) ) { if ( first ) { sampleResult . latencyEnd ( ) ; first = false ; } if ( asMD5 && ( md != null ) ) { md . update ( readBuffer , 0 , bytesRead ) ; totalBytes += bytesRead ; } else { w . write ( readBuffer , 0 , bytesRead ) ; } } if ( first ) { sampleResult . latencyEnd ( ) ; } in . close ( ) ; w . flush ( ) ; if ( asMD5 && ( md != null ) ) { byte [ ] md5Result = md . digest ( ) ; <START_BUG> w . write ( JOrphanUtils . baToHexString ( md5Result ) . getBytes ( ) ) ; <END_BUG> sampleResult . setBytes ( totalBytes ) ; } w . close ( ) ; return w . toByteArray ( ) ; } void mergeFileProperties ( ) { } }

Fix:
w . write ( JOrphanUtils . baToHexBytes ( md5Result ) ) ;